Exam (elaborations)
FAE (Fire Apparatus Engineer) questions with correct answers 2024/2025
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FAE (Fire Apparatus Engineer) questions with correct answers 2024/2025
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FAE (Fire Apparatus Engineer)62.5 lbs - ANSWhat does one cubic foot of water weigh?
1.728 cubic inches - ANSWhat does One cubic foot of water contain in inches?
7.5 gallons - ANSWhat does One cubic foot of water contain in gallons?
8.35 lbs - ANSWhat does One gallon of water weigh?
231 cubic inches - ANSWhat does One gallon of water contain in inches?
.434 psi - ANSWhat is One foot of water exert as a back pressure?
2.304 feet - ANSHow high will One psi elevate water?
14.7 psi - ANSWhat is atmospheric pressure at sea level?
34 feet - ANSWhat is the maximum lift for drafting? (Theoretically)
1.13 feet of lift - ANSHow high does One inch (1") mercury (inches in vacuum) lift?
10 psi - ANSWhat is the recommended minimum psi that should be maintained on the
compound gauge when taking water from a hydrant?
Stored or potential energy that is available to force water through pipes and fittings, fire hose,
and adapters. - ANSWhat is Static pressure?
That part of the total pressure that is not used to overcome friction or gravity while forcing water
through fire hose, pipe, fittings, and adapters. - ANSResidual Pressure
Take Static pressure and subtracting residual pressure which gets you your drop. Take your
drop and multiply it by (2)² for second line, (3)² for third line, (4)² for forth line, (5)² for fifth line. so
long as after you multiply drop and the multiplayer for the number line and still have 10 psi left
based off static pressure you can have that many lines if you have less than 10 psi you can not
operate that number of lines. - ANSHow to calculate psi loss for each additional line off hydrant
and know how many lines can be taken off hydrant?
Example: Static pressure: 65 psi Residual pressure : 60 psi
Drop: 5 psi
2nd line: 2²=4: 4x5= 20
3rd line: 3²=9: 9x5= 45
,4th line: 4²=16: 16x5= 80 This line can't be done because it is over 65 psi - ANSExamples of
how to calculate psi loss for each additional line off hydrant
1. 2 Hour: 100% @ 150 psi
2. 1/2 hour: 70% @ 200 psi
3. 1/2 hour: 50% @ 250 psi
4. 10 minutes: 100% @ 165 psi (overload or spurt test) - ANSWhat are all the steps in
Certification Test (pre-service tests)?
100% @ 165 psi (done in certification test for 10 minutes) - ANSWhat is a Spurt or Overload
test?
1. 20 minutes: 100% @ 150 psi
2. 10 minutes: 70 % @ 200 psi
3. 10 minutes: 50% @ 250 psi
Optional: 100% @ 165 psi (overload or spurt test) - ANSWhat are all the steps in a Service
Test?
100% capacity @ 150 psi net pump pressure
70% capacity @ 200 psi net pump pressure
50% capacity @ 250 psi net pump pressure - ANSWhat are Pump Tests?
Net Pump Pressure (NEP) is the measurement of the total work performed by the pump:
a. To lift water into the pump (drafting)
b. To discharge water from the pump
NEP= Suction Side Work(drafting) + Discharge Side Work - ANSWhat is Net Engine/Pump
Pressure (NEP)?
Examples:
Discharge gauge reads 165 psi but you are getting supplied by hydrant @ 65 psi on your intake
gauge. So the net pressure would only be 100 psi.
Now your are drafting and Intake gauge reads 20" mercury (-20) and Discharge reads 120 psi.
So your net pump pressure is 140 - ANSExamples of figuring out Net Engine/Pump Pressure
(NEP)
Pump Discharge Pressure (PDP) is:
PDP= Net pump pressure(NEP) - Suction Side Work - ANSWhat is Pump Discharge Pressure?
Suction Side Work(psi)= Lift (ft)+Intake Hose FL(Friction Loss) (psi) Divided by 2.3 - ANSHow
do you figure out Suction Side Work ?
100 psi - ANSWhat is Fog nozzle pressure for Hand held nozzle and Master Stream?
Hand Held : 50 psi
, Master Stream: 80 psi - ANSWhat is Smooth Bore nozzle pressures for Hand held nozzle and
Master Stream?
"For every action there is an equal and opposite reaction" - ANSWhat is Newton's Third Law of
motion pertaining to Nozzle Reaction?
As water leaks a nozzle under pressure, it causes a reactionary force in the opposite direction. -
ANSWhat is Nozzle Reaction?
The formula used for calculation of nozzle reaction is : NR= 1.57D²P - ANSWhat is the Nozzle
Reaction formula?
For fog nozzles and master stream smooth bore tips, fire ground nozzle reaction calculations
can be computed at approximately 1/2 the flow (measured in lbs.). - ANSWhat is fire ground
Nozzle Reaction calculations?
1. Air Resistance
2. Gravity - ANSWhat are the two variables that affect the reach of fire streams?
30-34 degrees - ANSWhat angle does a stream get the greatest horizontal reach?
60-75 degrees - ANSWhat angle does a stream get the maximum effective vertical reach?
10% to 15% - ANSWhat percent can head and tail winds affect the reach of a stream?
1"= 200 GPM
1-1/8"= 250 GPM
1-1/4"= 300 GPM
50 PSI FL for nozzle - ANSWhat is Hand Lines Solid Stream GPM for tips?
1-1/4"= 400 GPM
1-3/8"= 500 GPM
1-1/2"= 600 GPM
1-5/8"= 700 GPM
1-3/4"= 800 GPM
1-7/8"= 900 GPM
2"= 1000 GPM
80 PSI FL for nozzle - ANSWhat is Master Stream Solid Stream GPM for tips?
50 PSI nozzle: 1/8" change in nozzle diameter at 50 psi nozzle pressure changes the flow by
approximately 50 GPM
80 PSI Nozzle: 1/8" change in nozzle diameter at 80 psi nozzle pressure changes the flow by
approximately 100 GPM up to and including 2" tips - ANSWhat is One Eighth (1/8") Rule for
figuring out Nozzle GPM in a 50 PSI Hand line Smooth Bore?
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